To find out the concentration of SO2 in the air (in parts per million, i.e., ppm), the datawas collected for 30 localities in a certain city and is presented below:Concentration of SO2 in ppm 0.00-0.04 0.04-0.08 0.08-0.12 0.12-0.16 0.16-0.20 0.20-0.24Frequency 4 9 9 2 4 2Find the modeconcentration of SO2 in the air.